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feat(libsointu): make su_render return some error codes, typically due to FPU stack errors.

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This commit is contained in:
Veikko Sariola 2020-12-05 16:41:07 +02:00
parent 83937bb2ee
commit 7bb60de74e
3 changed files with 31 additions and 17 deletions
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10
include/sointu/sointu.h
View File

@ -83,9 +83,13 @@ void CALLCONV su_load_gmdls(void);
// time_out > time_in, as it is modulated and the time could advance by 2 or more, so the loop
// exit condition would fire when the current time is already past time_in
//
// Returns error code:
// 0 everything ok
// (no actual errors implemented yet)
// Returns an error code, which is actually just masked version of the FPU Status Word
// On a succesful run, the return value should be 0
// Error code bits:
// bit 0 FPU invalid operation (stack over/underflow OR invalid arithmetic e.g. NaNs)
// bit 2 Divide by zero occurred
// bit 6 Stack overflow or underflow occurred
// bits 11-13 The top pointer of the fpu stack. Any other value than 0 indicates that some values were left on the stack.
int CALLCONV su_render(Synth* synth, float* buffer, int* samples, int* time);
// Arithmetic opcode ids

4
render.asm
View File

@ -209,7 +209,9 @@ su_render_samples_time_finish:
pop _SI ; pop the pointer to samples
mov dword [_SI], edx ; *samples = samples rendered
mov dword [_BX], eax ; *time = time ticks rendered
xor eax, eax ; TODO: set eax to possible error code, now just 0
xor eax, eax
fnstsw ax ; store the FPU status flag in ax.
and ax, 0011100001000101b ; mask TOP pointer, stack error, zero divide and invalid operation
frstor [_SP] ; restore fpu state
add _SP,108 ; rewind the stack allocate for FPU state
%if BITS == 32 ; stdcall

34
tests/test_render_samples_api.c
View File

@ -43,18 +43,15 @@ int main(int argc, char* argv[]) {
time = 0;
errcode = su_render(synth, buffer, &samples, &time);
if (errcode != 0)
{
printf("su_render returned error");
goto fail;
}
if (samples > 0)
{
printf("su_render rendered samples, despite it should not");
printf("su_render rendered samples, despite it should not\n");
goto fail;
}
if (time > 0)
{
printf("su_render advanced time, despite it should not");
printf("su_render advanced time, despite it should not\n");
goto fail;
}
// Then check that when we render using su_render with 0 samples,
@ -62,19 +59,16 @@ int main(int argc, char* argv[]) {
samples = 0;
time = INT32_MAX;
errcode = su_render(synth, buffer, &samples, &time);
if (errcode != 0)
{
printf("su_render returned error");
if (errcode != 0)
goto fail;
}
if (samples > 0)
{
printf("su_render rendered samples, despite it should not");
printf("su_render rendered samples, despite it should not\n");
goto fail;
}
if (time > 0)
{
printf("su_render advanced time, despite it should not");
printf("su_render advanced time, despite it should not\n");
goto fail;
}
// Then check that each time we call render, only SAMPLES_PER_ROW
@ -84,7 +78,9 @@ int main(int argc, char* argv[]) {
// check that buffer full
samples = 1;
time = INT32_MAX;
su_render(synth, &buffer[totalrendered*2], &samples, &time);
errcode = su_render(synth, &buffer[totalrendered*2], &samples, &time);
if (errcode != 0)
goto fail;
totalrendered += samples;
if (samples != 1)
{
@ -98,7 +94,9 @@ int main(int argc, char* argv[]) {
}
samples = SAMPLES_PER_ROW - 1;
time = INT32_MAX;
su_render(synth, &buffer[totalrendered * 2], &samples, &time);
errcode = su_render(synth, &buffer[totalrendered * 2], &samples, &time);
if (errcode != 0)
goto fail;
totalrendered += samples;
if (samples != SAMPLES_PER_ROW - 1)
{
@ -124,6 +122,16 @@ finish:
free(buffer);
return retval;
fail:
if (errcode > 0) {
if ((errcode & 0xFF00) != 0)
printf("FPU stack was not empty on exit\n");
if ((errcode & 0x04) != 0)
printf("FPU zero divide\n");
if ((errcode & 0x01) != 0)
printf("FPU invalid operation\n");
if ((errcode & 0x40) != 0)
printf("FPU stack error\n");
}
retval = 1;
goto finish;
}